JP4424226B2 - Thermoelectric conversion module and method for fixing post electrode in thermoelectric conversion module - Google Patents

Description

  The present invention relates to a thermoelectric conversion module provided with a post electrode and a method for fixing the post electrode in the thermoelectric conversion module.

  Conventionally, a thermoelectric conversion module that performs thermoelectric conversion using the Peltier effect, which is one of thermoelectric conversions, is attached to a semiconductor laser package and used for temperature adjustment such as heating and cooling (see, for example, Patent Document 1). ). In this thermoelectric conversion module, a plurality of electrodes are formed at predetermined locations on opposite inner surfaces of a pair of insulating substrates, and the upper and lower end surfaces of the thermoelectric elements are soldered to the opposite electrodes, respectively. A plurality of thermoelectric elements are fixed between the insulating substrates.

One end portion of the insulating substrate disposed on the lower side of the pair of insulating substrates is extended outward, and a thin flat rectangular wire is formed on the upper surface of the electrode formed on the upper surface of the extended portion. Is attached as a bonding part for inspection. Furthermore, a post electrode is attached as a bonding part for mounting to a portion corresponding to the electrode on the upper surface of the flat wire. In this case, the bonding between the electrode and the flat wire and the bonding between the flat wire and the post electrode are performed by soldering. In addition, such soldering is generally performed by installing solder at each joint, and heating the thermoelectric conversion module in that state in a reflow furnace or the like.
JP 2004-296604 A

  However, the above-described conventional thermoelectric conversion module has a problem that misalignment or inclination tends to occur when the post electrode is soldered. In this case, when the post electrode is large and has a flat shape, it is difficult to cause positional deviation and inclination, and even if some positional deviation occurs, there is little problem, but if the post electrode is small, the aspect ratio ( When the ratio of the height to the length of the short side among the sides extending in the left-right or front-rear direction is high, the post electrode is likely to be inclined or displaced due to the influence of the surface tension of the molten solder. For this reason, there is a problem in that the accuracy of wire bonding for connecting a wire to a post electrode in a subsequent process is adversely affected. In order to prevent this, soldering must be performed while fixing the post electrode so as not to cause misalignment or inclination, and the structure of the apparatus becomes complicated, or a separate jig is required. There is also a problem that.

  The present invention has been made to address the above-described problems, and its purpose is to provide a thermoelectric conversion module capable of accurately fixing a block-shaped post electrode to an electrode without causing displacement or inclination. And a method for fixing a post electrode in a thermoelectric conversion module.

In order to achieve the above-described object, the structural feature of the thermoelectric conversion module according to the present invention is that an electrode is formed at a predetermined location on both sides of a pair of substrates that are arranged vertically and opposed to each other. A thermoelectric conversion module configured by fixing upper and lower end surfaces, respectively, extending one end of a lower substrate of a pair of substrates in a horizontal direction to form a substrate extension, and An electrode extension is formed on the upper surface by extending the electrode or forming an isolation electrode at a predetermined distance from the electrode, and a predetermined portion of the electrode extension formed by extending the electrode or the electrode and the isolation electrode between, to form a post electrode installation section configured to expose the surface of the substrate extension portion, the post electrode installation section, with the aspect ratio was set to 0.8 or more block-shaped post electrode The In that there was a solid boss and the post electrodes installed solder electrodes extension between the periphery and the electrode extension portions of the gate electrode.

  In the thermoelectric conversion module according to the present invention, the post electrode is installed on the electrode via solder, and the post electrode is fixed to the electrode by solidifying after heating and melting the solder in that state. Instead, a post electrode installation part is formed in the electrode extension part, and the post electrode is installed in the post electrode installation part in a state of being in contact with the surface of the substrate extension part. And it fixes to the electrode extension part by soldering the post electrode of the state installed in the post electrode installation part.

  In this case, the solder is placed not between the surface of the substrate extension, which is the bottom surface of the post electrode installation portion, and the post electrode, but between the periphery of the post electrode and the electrode extension, and is solidified after being heated and melted. Fix the post electrode to the electrode extension. Accordingly, it is possible to prevent the post electrode from being displaced or inclined due to the influence of the surface tension of the solder when the solder is melted. Further, the post electrode is accurately fixed at the set position by the post electrode installation portion. Furthermore, even when the post electrode is small or the aspect ratio is high, the post electrode can be fixed to the set position without being inclined.

  The electrode extension in this case may be formed by extending an electrode provided on the lower substrate, or an isolation electrode is formed on the end side of the substrate extension with a predetermined distance from the electrode. May be formed. When the electrode extension portion is formed by extending the electrode, the post electrode installation portion is formed by providing a notch portion such as a window portion in the electrode extension portion. Further, when the electrode extension portion is formed of an isolation electrode, a post electrode installation portion is configured between the electrode and the isolation electrode.

In addition, the structural feature of the fixing method of the post electrode in the thermoelectric conversion module according to the present invention is that the lower substrate is opposed to the upper and lower sides with one end of the lower substrate extending outward from the one end of the upper substrate. A method for fixing a post electrode in a thermoelectric conversion module, in which electrodes are formed at predetermined positions on both opposing surfaces of a pair of arranged substrates, and upper and lower end faces of a thermoelectric element are fixed to the electrodes, respectively, An electrode extension is formed by extending an electrode on the upper surface of the extension portion of the substrate or by forming an isolation electrode at a predetermined distance from the electrode, and a predetermined portion of the electrode extension formed by extending the electrode. Alternatively, a post electrode placement portion forming step for forming a post electrode placement portion configured by exposing the surface of the extension portion of the lower substrate between the electrode and the isolation electrode, and a surface of the extension portion of the lower substrate are contacted. The post electrode installation section while being, placing the solder between the post electrode disposed process aspect ratio installing 0.8 or more block-shaped post electrodes, and the periphery of the electrode extension and the post electrodes There is a solder installation step and a post electrode fixing step of fixing the post electrode to the electrode extension by irradiating the solder with laser light.

  According to this, it is possible to accurately fix the post electrode at the set position without causing any positional deviation or inclination. Further, in this case, the post electrode is fixed by irradiating the solder disposed between the electrode extension portion and the post electrode, so that only the solder can be heated in a spot manner. For this reason, soldering can be performed with high accuracy.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a thermoelectric conversion module 10 according to the present embodiment. The thermoelectric conversion module 10 includes a pair of insulating substrates including a rectangular lower plate 11 and an upper substrate 12 made of alumina. Both the width and length of the lower substrate 11 are set to be larger than the width and length of the upper substrate 12, and from one end portion along the longitudinal direction of the upper substrate 12 (right end portion in FIGS. 2 and 3). Also, one end portion along the longitudinal direction of the lower substrate 11 protrudes along the horizontal direction. A substrate extension portion 11a according to the present invention is constituted by the protruding portion. Further, as shown in FIG. 2, the other end portion of the lower substrate 11 and both side portions in the width direction protrude slightly outward from the corresponding side portions of the upper substrate 12.

  A plurality of lower electrodes 13 are formed on the upper surface of the lower substrate 11 at regular intervals, and a plurality of upper electrodes 14 are formed on the lower surface of the upper substrate 12 at regular intervals. A plurality of thermoelectric elements 15 made of a bismuth-tellurium alloy formed in a rectangular parallelepiped are fixed to the lower electrode 13 by soldering at the lower end surface, and fixed to the upper electrode 14 by soldering at the lower end surface. The side substrate 11 and the upper substrate 12 are integrally connected. In addition, the lower electrode 13 and the upper electrode 14 are each formed in a rectangular shape in which two thermoelectric elements 15 can be installed at a distance.

  The upper electrode 14 is formed on the upper substrate 12 with a distance equal to approximately one thermoelectric element 15 from the lower electrode 13. That is, the lower end surfaces of the two thermoelectric elements 15 are joined to the lower electrodes 13 so that the thermoelectric elements 15, the lower electrode 13, and the upper electrode 14 are electrically connected to each other. The upper end surface is joined to each upper electrode 14. The thermoelectric element 15 includes a P-type thermoelectric element and an N-type thermoelectric element, and the P-type thermoelectric element and the N-type thermoelectric element are alternately arranged. Both the P-type thermoelectric element and the N-type thermoelectric element are made of Bi or Te, but their compositions are slightly different.

  In addition, an isolation electrode 13a is formed on the end portion of the upper surface of the substrate extension portion 11a with a lower electrode 13 provided at two corners on one end side of the lower substrate 11 at a predetermined interval. Yes. The width of the isolation electrode 13 a (the length in the front-rear direction in FIG. 2) is set to be the same as the width of the lower electrode 13, and the length (the length in the left-right direction in FIG. 2) is the length of the lower electrode 13. It is set to about 1/5 to 1/10. An electrode extension portion according to the present invention is formed between the end portion of the lower electrode 13 and the outer end portion of the isolation electrode 13a, and a portion between the lower electrode 13 and the isolation electrode 13a on the upper surface of the substrate extension portion 11a. A post electrode installation portion 16 according to the present invention is configured.

  And between the lower electrode 13 and the isolation electrode 13a which comprise the post electrode installation part 16, the block-shaped post electrode 17 is installed in the state which mounted the bottom face directly on the upper surface of the board | substrate extension part 11a, respectively. Each post electrode 17, the lower electrode 13, and the isolation electrode 13 a are fixed by solder 18. The post electrode 17 is configured by sequentially forming a nickel plating layer having a thickness of 2 μm and a gold plating layer having a thickness of 1 μm on the surface of a main body portion made of copper.

  The length of the thermoelectric conversion module 10 in the vertical direction (longitudinal direction) is set to 8 mm, the length in the horizontal direction (width direction) is set to 3 mm, and the height is set to 1.5 mm. In addition, the longitudinal and lateral lengths of both the upper and lower end faces of the thermoelectric element 15 are both set to 0.5 mm and the height is set to 0.8 mm. Furthermore, the length of each part of the post electrode 17 is set to 0.5 mm for the short side a, 1 mm for the long side b, and 1 mm for the height c as shown in FIG. For this reason, the aspect ratio c / a of the post electrode 17 is 2.

  Next, a method for manufacturing the thermoelectric conversion module 10 will be described. In this case, first, as shown in FIGS. 5 and 6, the lower electrode 13 and the isolation electrode 13 a are formed on the upper surface of the lower substrate 11. The lower electrode 13 and the isolation electrode 13 a are formed by sequentially laminating a copper layer, a nickel layer, and a gold layer on the upper surface of the lower substrate 11. Next, solder paste is applied to the upper surfaces of the lower electrode 13 and the isolation electrode 13a by solder printing to form a solder paste layer 18a as shown in FIG.

  In this case, on the upper surface of the lower electrode 13 provided at two corners on one end side of the lower substrate 11, one end edge portion of the lower electrode 13 from most of the central side except the edge portion of the lower electrode 13. Then, the solder paste layer 18a is formed, and on the other upper surface of the lower electrode 13, the solder paste layer 18a is formed in almost the central portion excluding the edge. In addition, a solder paste layer 18a is formed on the upper surface of the isolation electrode 13a from almost the center side except the edge to the other end edge of the isolation electrode 13a.

  Next, a process of attaching the thermoelectric element 15 to the upper surface of the solder paste layer 18 a on the lower electrode 13 and attaching the post electrode 17 to the post electrode installation portion 16 is performed. In this case, as shown in FIGS. 8 and 9, two thermoelectric elements 15 are placed on the upper surface of each lower electrode 13 at intervals. Further, the post electrode 17 is temporarily fixed to the upper surface of the substrate extension portion 11a in the post electrode installation portion 16 by using a flux (a paste-like adhesive). Next, the upper electrode 14 and the solder paste layer 18b (see FIG. 10) are formed on the lower surface of the upper substrate 12 by the same process.

  Next, the upper substrate 12 in that state is placed on the upper side of the lower substrate 11 with the upper electrodes 14 aligned with the upper end surfaces of the predetermined thermoelectric elements 15 to obtain the state shown in FIG. Then, the temporarily assembled thermoelectric conversion module 10a is heated while being sandwiched and fixed between the lower heater portion 19a and the upper heater portion 19b of the heating device 19, as shown in FIG. As a result, the solder paste layer 18a between the lower electrode 13 and the thermoelectric element 15 and the solder paste layer 18b between the upper electrode 14 and the thermoelectric element 15 are melted, and the gap between the lower electrode 13 and the thermoelectric element 15, respectively. The upper electrode 14 and the thermoelectric element 15 are in close contact with each other.

  Further, the solder paste layer 18 a on the lower electrode 13 and the solder paste layer 18 a on the isolation electrode 13 a located on both sides of the post electrode 17 are also melted and closely adhered to the lower end side portion of the post electrode 17. Subsequently, the thermoelectric conversion module 10a is taken out of the heating device 19 and cooled, so that the molten solder paste layers 18a and 18b are solidified into the solder 18 to obtain the thermoelectric conversion module 10 shown in FIGS. It is done.

  In this case, as shown in FIG. 12, each thermoelectric element 15 and the post electrode 17 are fixed and electrically connected by the solder 18. During this process, the post electrode 17 is maintained in a position positioned at the set position in the post electrode installation portion 16 without being affected by melting or solidification of the solder paste layer 18a. For this reason, the process at the time of wire bonding to the post electrode 17 can be performed in a good state later.

  As described above, in the thermoelectric conversion module 10 according to the present embodiment, the separation electrode 13a is formed at the end portion side portion on the upper surface of the substrate extension portion 11a with a space from the lower electrode 13, and the lower electrode 13 and the separation electrode are formed. A post electrode installation part 16 is provided between the terminal 13a and the terminal 13a. Then, the post electrode 17 is placed on the post electrode placement portion 16 in a state where it is placed directly on the surface of the substrate extension portion 11a, and is fixed to the lower electrode 13 and the isolation electrode 13a by soldering. In this case, the solder paste layer 18a formed for soldering is not between the surface of the substrate extension 11a and the post electrode 17, but between the lower electrode 13 and the isolation electrode 13a located on both sides of the post electrode 17. It is formed on the upper surface.

  The solder paste layer 18a is heated and melted, extends to the post electrode 17 side, adheres to the post electrode 17, and solidifies in a state where the post electrode 17 is connected to the lower electrode 13 and the isolation electrode 13a. Accordingly, it is possible to prevent the post electrode 17 from being displaced or inclined due to the surface tension of the solder paste layer 18a when the solder paste layer 18a is melted. The post electrode 17 is also prevented from being displaced by the lower electrode 13 and the isolation electrode 13a, and is fixed at a set position in the post electrode installation portion 16. Furthermore, even when the size of the post electrode 17 is small or when the height is high, the post electrode 17 is fixed without being inclined to the set position.

(Second Embodiment)
FIG. 13 shows a thermoelectric conversion module 20 according to the second embodiment of the present invention. In the thermoelectric conversion module 20, the lower electrode 23 and the isolation electrode 23a formed on the upper surface of the lower substrate 21 are configured as shown in FIG. That is, the substrate extended to one end side of the lower substrate 21 at the corner portion located on the inner side of the lower substrate 21 in each lower electrode 23 provided at two corner portions on one end side of the lower substrate 21. A slip prevention portion 23b extending toward the extension portion 21a is formed.

  Further, a shift prevention portion 23c extending to the main body side of the lower substrate 21 is formed at a corner portion located on the outer side of the lower substrate 21 in both the isolation electrodes 23a. A post electrode 27 is fixed by solder 28 to a portion surrounded by the lower electrode 23, both isolation electrodes 23a, and the shift prevention portions 23b, 23c on the upper surface of the substrate extension 21a. An upper electrode 24 (see FIG. 16) is formed on the lower surface of the upper substrate 22, and a thermoelectric element 25 is fixed between the lower electrode 23 and the upper electrode 24.

  The thermoelectric conversion module 20 is manufactured as follows. First, as shown in FIG. 14, the lower electrode 23, the isolation electrode 23 a and the shift prevention portions 23 b and 23 c are formed on the upper surface of the lower substrate 21, and the upper electrode 24 is formed on the lower surface of the upper substrate 22. The lower electrode 23 and the like are formed by sequentially laminating a copper layer, a nickel layer, and a gold layer on the upper surface of the lower substrate 21 as in the lower electrode 13 and the like. Next, a solder paste is applied to the upper surfaces of the lower electrode 23 and the isolation electrode 23a formed on the upper surface of the lower substrate 21 by solder printing to form a solder paste layer 28a as shown in FIG. Further, a solder paste layer 28b (see FIG. 16) is also formed on almost the central portion excluding the edge on the lower surface of the upper electrode 24 formed on the lower surface of the upper substrate 22.

  Next, the thermoelectric element 25 is attached to the upper surface of the solder paste layer 28 a on the lower electrode 23, and the upper substrate 22 is placed on the upper side of the lower substrate 21 so that each upper electrode 24 is aligned with the upper end surface of the predetermined thermoelectric element 25. The state shown in FIG. 16 is overlapped. Then, the temporarily assembled thermoelectric conversion module 20 a is heated in a state of being fixed by the heating device 19. As a result, the solder paste layer 28a between the lower electrode 23 and the thermoelectric element 25 and the solder paste layer 28b between the upper electrode 24 and the thermoelectric element 25 are melted, and the gap between the lower electrode 23 and the thermoelectric element 25 is reached. The upper electrode 24 and the thermoelectric element 25 are in close contact with each other. Next, when the thermoelectric conversion module 20a is taken out of the heating device 19 and cooled, the molten solder paste layers 28a and 28b are solidified, and the lower electrode 23 and the thermoelectric element 25, and the upper electrode 24 and the thermoelectric element 25 are fixed. The

  Next, the post electrode 27 is attached to the post electrode installation part 26 configured between the lower electrode 23, the isolation electrode 23a, and the shift prevention parts 23b and 23c. In this case, the post electrode 27 is temporarily fixed to the upper surface of the substrate extension 21a in the post electrode installation portion 26 using a flux, and a laser is applied to the solder paste layer 28a near both sides of the lower end of the post electrode 27 in that state. Irradiate light. By this laser light irradiation, the solder paste layer 28 a on the upper surface of the lower electrode 23 and the isolation electrode 23 a is melted and is in close contact with the lower end side portion of the post electrode 27. Next, the solder paste layer 28a is cooled and solidified, whereby the solder 28 is formed, and the thermoelectric conversion module 20 shown in FIG. 13 is obtained.

  In the thermoelectric conversion module 20, the post electrode 27 is set not only in the longitudinal displacement of the thermoelectric conversion module 20 but also in the width direction of the thermoelectric conversion module 20 by the displacement preventing portions 23 b and 23 c. The position is fixed with higher accuracy. Further, the solder paste layer 28a formed on the lower end side of the post electrode 27 is melted by irradiating laser light and then solidified to fix the post electrode 27, so that only the solder paste layer 28a is spotted. Can be heated. For this reason, it is possible to perform soldering accurately without affecting the post electrode 27 by heat. About the other effect of this thermoelectric conversion module 20, it is the same as that of the thermoelectric conversion module 10 of 1st Embodiment mentioned above.

(Third embodiment)
FIG. 17 shows a thermoelectric conversion module 30 according to the third embodiment of the present invention. In this thermoelectric conversion module 30, as shown in FIG. 18, one end of each lower electrode 33 provided at two corners on one end of the lower substrate 31 is extended to the upper surface of the substrate extension 31a. The electrode extension portion 33a of the present invention is constituted by that portion. Inside the electrode extension 33a, a square window-shaped post electrode installation portion 36 is formed with the upper surface of the substrate extension 31a exposed. Further, the size of the post electrode installation portion 36 is set to be slightly larger than the end face of the post electrode 37. The post electrode 37 is fixed to the electrode extension 33a by solder 38 around the post electrode 37 while being placed on the upper surface of the substrate extension 31a.

  About the structure of the other part of this thermoelectric conversion module 30, it is the same as the thermoelectric conversion module 10 which concerns on 1st Embodiment mentioned above. The method for manufacturing the thermoelectric conversion module 30 is also the same as that of the thermoelectric conversion module 10 according to the first embodiment described above. Accordingly, the same parts are denoted by the same reference numerals, and description thereof is omitted. Further, the manufacturing method of the thermoelectric conversion module 30 is the same as that of the thermoelectric conversion module 10. With this configuration, the periphery of the lower end portion of the post electrode 37 is completely surrounded by the electrode extension portion 33a. As a result, the post electrode 37 is accurately fixed at the set position in a state in which occurrence of displacement and inclination is further reliably prevented. About the other effect of this thermoelectric conversion module 30, it is the same as that of the thermoelectric conversion module 10 of 1st Embodiment mentioned above.

  Next, each thermoelectric conversion module 10 formed by changing the length of each side of the post electrode 17 of the thermoelectric conversion module 10 according to the first embodiment is referred to as Examples 1 to 6, and the post electrode of the conventional thermoelectric conversion module The thermoelectric conversion modules formed by setting the length of each side to be the same as those of the post electrodes 17 of Examples 1 to 6 are referred to as Comparative Examples 1 to 6, and the inclination generated in the post electrodes 17 of each thermoelectric conversion module 10 and the like A comparative test of misalignment was performed. As a conventional thermoelectric conversion module, a module in which a lower electrode is extended to a substrate extension of a lower substrate and a post electrode is fixed to the upper surface of the lower substrate through solder.

  Further, as shown in FIG. 19, the inclination is indicated by an angle d when the central axis of the post electrode 17 or the like is inclined from the vertical state, and the positional deviation is the height of the horizontal central deviation e and the height. This is indicated by the direction deviation f. The center deviation e in the horizontal direction is a length value when the center of the upper end surface of the post electrode 17 etc. is displaced in the horizontal direction from the center of the set installation position of the post electrode 17 etc., and the deviation f in the height direction is The height difference between the central portion of the upper end surface of the post electrode 17 and the like and the corner portion at the highest position was used. Moreover, the test prepared 10 thermoelectric conversion modules 10 of each Example 1-6 and Comparative Examples 1-6, respectively, and compared each maximum value of 10 thermoelectric conversion modules 10 grade | etc.,. The results of this comparative test are shown in Table 1 below.

  As shown in Table 1, the height c of the post electrode 17 and the like was set to 0.5 mm in Examples 1 to 4 and Comparative Examples 1 to 4, and 1 mm in Examples 5 and 6 and Comparative Examples 5 and 6. . Further, the short sides a of the post electrode 17 and the like are 0.6 mm in Example 1 and Comparative Example 1, 0.5 mm in Examples 2 and 6 and Comparative Examples 2 and 6, and 0 in Example 3 and Comparative Example 3, respectively. 4 mm, Example 4 and Comparative Example 4 were set to 0.3 mm, and Example 5 and Comparative Example 5 were set to 1 mm. Further, the long side b of the post electrode 17 and the like is 0.6 mm in Example 1 and Comparative Example 1, 0.5 mm in Examples 2 to 4 and Comparative Examples 2 to 4, and Examples 5 and 6 and Comparative Example 5, respectively. , 6 was set to 1 mm.

  For this reason, the aspect ratios c / a of Examples 1 to 6 and Comparative Examples 1 to 6 are 0.8 for Example 1 and Comparative Example 1, and 1. for Examples 2 and 5 and Comparative Examples 2 and 5, respectively. 0 or 1, Example 3 and Comparative Example 3 were 1.3, Example 4 and Comparative Example 4 were 1.7, Example 6 and Comparative Example 6 were 2. As a result of the comparative test, the slope d was 0.5 to 1.0 in Examples 1 to 6, whereas it was 0.9 to 4 in Comparative Examples 1 to 6, and Examples 1 to 6 were. The overall value was better than Comparative Examples 1-6. In particular, in Comparative Examples 2 to 6 except Comparative Example 1, the high values of 1.5 to 4 are shown, and accordingly, in Examples 1 to 6, the occurrence of inclination is small. I understand.

  Moreover, about the center shift | offset | difference e of the horizontal direction, it was 0.035-0.060 in Examples 1-6, but was 0.090-0.247 in Comparative Examples 1-6. From this result, it can be seen that in Examples 1 to 6, the lateral center shift is significantly less than in Comparative Examples 1 to 6. Further, the deviation f in the height direction was 0.019 to 0.032 in Examples 1 to 6, whereas it was 0.062 to 0.081 in Comparative Examples 1 to 6. From this result, it can be seen that in Examples 1 to 6, the deviation in the height direction is significantly less than in Comparative Examples 1 to 6. In this way, by providing the post electrode installation portion 16 and the like and fixing the post electrode 17 and the like to the portion, the thermoelectric conversion module 10 in which the inclination and the positional deviation are greatly reduced as compared with the conventional thermoelectric conversion module. It can be seen that it can be obtained.

  The present invention is not limited to the above-described embodiments, and can be modified as appropriate. For example, the material constituting the lower substrate 11 or the like or the upper substrate 12 is not limited to alumina, and a metal substrate such as aluminum nitride, silicon carbide, silicon nitride, or aluminum whose surface is insulated as long as it is an insulating substrate. Or the like. Further, as the post electrode 17 and the like, brass can be used in addition to copper. In addition, the material, shape, size, and the like of each member constituting the thermoelectric conversion module 10 and the like can be changed according to the purpose of use.

It is the perspective view which showed the thermoelectric conversion module which concerns on 1st Embodiment of this invention. It is a top view of the thermoelectric conversion module shown in FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is explanatory drawing for demonstrating the length of each edge | side of a post electrode. It is the top view which showed the state which formed the electrode and the isolation electrode in the lower board | substrate. FIG. 6 is a front view of FIG. 5. It is the top view which showed the state in which the solder paste layer was formed in the upper surface of an electrode and an isolation electrode. It is the top view which showed the state which installed the thermoelectric element and the post electrode in the lower board | substrate. It is a front view of FIG. It is the front view which showed the state which assembled | attached the lower board | substrate and the upper board | substrate. It is the front view which showed the state which heats the thermoelectric conversion module shown in FIG. 10 with a heating apparatus. It is a partially cutaway front view showing a state where a thermoelectric element and a post electrode are fixed with solder. It is the top view which showed the thermoelectric conversion module which concerns on 2nd Embodiment of this invention. It is the top view which showed the state which formed the electrode and the isolation electrode in the lower board | substrate with which the thermoelectric conversion module shown in FIG. 13 is provided. FIG. 15 is a plan view showing a state where a solder paste layer is formed on the upper surfaces of the electrode and the isolation electrode shown in FIG. 14. It is the front view which showed the state which assembled | attached the lower board | substrate and the upper board | substrate via the thermoelectric element. It is the top view which showed the thermoelectric conversion module which concerns on 3rd Embodiment of this invention. FIG. 18 is a plan view showing a state in which an electrode and an electrode extension are formed on a lower substrate included in the thermoelectric conversion module shown in FIG. 17. It is explanatory drawing for demonstrating the inclination of a post electrode, and position shift.

Explanation of symbols

10, 20, 30 ... thermoelectric conversion module, 11, 21, 31 ... lower substrate, 11a, 21a ... substrate extension, 12, 22 ... upper substrate, 13, 23, 33 ... lower electrode, 13a, 23a ... isolation electrode 14, 24 ... Upper electrode, 15, 25 ... Thermoelectric element, 16, 26, 36 ... Post electrode installation part, 17, 27, 37 ... Post electrode, 18, 28, 38 ... Solder, 18a, 28a ... Solder paste layer , 23b, 23c... Prevention portion, 33a... Electrode extension portion.

Claims (2)

A thermoelectric conversion module configured by forming electrodes at predetermined locations on both sides of a pair of substrates that are vertically arranged opposite to each other, and fixing the upper and lower end surfaces of the thermoelectric elements to the electrodes,
One end of the lower substrate of the pair of substrates is extended in the horizontal direction to form a substrate extension, and the electrode is extended on the upper surface of the substrate extension, or a predetermined distance from the electrode An electrode extension is formed by forming an isolation electrode while maintaining a predetermined portion of the electrode extension formed by extending the electrode or the surface of the substrate extension between the electrode and the isolation electrode It is exposed to form a composed post electrode installation section and the post electrode installation section, with the aspect ratio was set to 0.8 or more block-shaped post electrode, the the periphery of the post electrode electrode thermoelectric conversion module, characterized in that was solid boss and the post electrode and before Symbol electrode extension by installing a solder between the extensions. An electrode is formed at a predetermined location on both opposing surfaces of a pair of substrates arranged vertically opposite to each other with one end portion of the lower substrate extending outward from one end portion of the upper substrate. A method for fixing a post electrode in a thermoelectric conversion module configured by fixing upper and lower end faces of a thermoelectric element,
An electrode extension is formed on the upper surface of the extension portion of the lower substrate by extending the electrode or forming an isolation electrode at a predetermined distance from the electrode, and the electrode is extended. A post electrode placement portion forming step for forming a post electrode placement portion configured by exposing a surface of the extension portion of the lower substrate between a predetermined portion of the electrode extension portion or the electrode and the isolation electrode;
The post electrode installation section in a state in contact with the surface of the extension portion of the lower substrate, and the post electrodes installed process aspect ratio installing 0.8 or more block-shaped post electrode,
Solder installing step of installing a solder between the periphery of the post electrodes and the electrode extension,
And a post electrode fixing step of fixing the post electrode to the electrode extension by irradiating the solder with a laser beam.

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